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First, it's important to understand that balloons are made of flexible materials (such as latex or aluminum foil) and are prone to deformation and breakage. Therefore, the core focus should be on the material's characteristics, addressing key issues such as adhesion, deformation, and paint cracking. This starts with pre-treatment, such as pre-treating the balloons. Latex balloons may have a release agent on their surface and require cleaning. Aluminum foil has a smooth surface and may require roughening without damaging it. Next, consider the paint. It must be flexible; conventional hard paints cannot be used, as they will crack if pinched. For example, acrylic elastic paint or fabric paint should be used. Environmental considerations should also be taken into account, as the balloons may come into contact with hands or be used for decorative purposes, such as in children's settings.